The function of stomodeal valve in the gut of the cockroach is to prevent the regurgitation of partially digested food from
(a) Midgut into crop
(b) Pre-oral cavity
(c) Midgut into hindgut
(d) None of these

Options

A. Midgut into crop
B. Pre-oral cavity
C. Midgut into hindgut
D. None of these

Answer

To solve the question regarding the function of the stomodeal valve in the gut of the cockroach, we can follow these steps:

### Step-by-Step Solution:

1. **Understand the Structure**: The stomodeal valve is located at the junction of the gizzard and the midgut in the cockroach's digestive system.

2. **Identify the Function**: The primary function of the stomodeal valve is to prevent the regurgitation of partially digested food. Regurgitation refers to the backward movement of food from one part of the digestive tract to another.

3. **Analyze the Options**:
- **Option A**: Midgut into crop - This suggests that the valve prevents food from moving back into the crop from the midgut.
- **Option B**: Pre-oral cavity - This is not relevant as the pre-oral cavity is not directly involved with the midgut or gizzard.
- **Option C**: Midgut into hindgut - This option does not relate to the function of the stomodeal valve, as it is not responsible for preventing food from moving into the hindgut.
- **Option D**: None of these - This option would imply that the valve does not prevent regurgitation, which contradicts its known function.

4. **Conclusion**: Since the stomodeal valve specifically prevents the regurgitation of partially digested food from the midgut back into the crop, the correct answer is **(a) Midgut into crop**.

### Final Answer:
**(a) Midgut into crop**

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